public virtual HorizontalAlignment Parse(Windows.UI.Xaml.HorizontalAlignment horizontalAlignment)
{
switch (horizontalAlignment)
{
case Windows.UI.Xaml.HorizontalAlignment.Left:
return(HorizontalAlignment.Left);
case Windows.UI.Xaml.HorizontalAlignment.Center:
return(HorizontalAlignment.Center);
case Windows.UI.Xaml.HorizontalAlignment.Right:
return(HorizontalAlignment.Right);
case Windows.UI.Xaml.HorizontalAlignment.Stretch:
return(HorizontalAlignment.Fill);
}
throw new ArgumentOutOfRangeException("horizontalAlignment");
}
void UpdateBarIcons()
{
if (Control == null || Element == null)
{
return;
}
if (!Element.IsSet(Specifics.HeaderIconsEnabledProperty))
{
return;
}
bool headerIconsEnabled = Element.OnThisPlatform().GetHeaderIconsEnabled();
bool invalidateMeasure = false;
// Get all stack panels affected by update.
var stackPanels = Control.GetDescendantsByName <WStackPanel>(TabBarHeaderStackPanelName);
foreach (var stackPanel in stackPanels)
{
int stackPanelChildCount = stackPanel.Children.Count;
for (int i = 0; i < stackPanelChildCount; i++)
{
var stackPanelItem = stackPanel.Children[i];
if (stackPanelItem is WImage tabBarImage)
{
// Update icon image.
if (tabBarImage.GetValue(FrameworkElement.NameProperty).ToString() == TabBarHeaderImageName)
{
if (headerIconsEnabled)
{
if (Element.IsSet(Specifics.HeaderIconsSizeProperty))
{
Size iconSize = Element.OnThisPlatform().GetHeaderIconsSize();
tabBarImage.Height = iconSize.Height;
tabBarImage.Width = iconSize.Width;
}
tabBarImage.HorizontalAlignment = WHorizontalAlignment.Center;
tabBarImage.Visibility = WVisibility.Visible;
}
else
{
tabBarImage.Visibility = WVisibility.Collapsed;
}
invalidateMeasure = true;
}
}
else if (stackPanelItem is WTextBlock tabBarTextblock)
{
// Update text block.
if (tabBarTextblock.GetValue(FrameworkElement.NameProperty).ToString() == TabBarHeaderTextBlockName)
{
if (headerIconsEnabled)
{
// Remember old values so we can restore them if icons are collapsed.
// NOTE, since all Textblock instances in this stack panel comes from the same
// style, we just keep one copy of the value (since they should be identical).
if (tabBarTextblock.TextAlignment != WTextAlignment.Center)
{
_oldBarTextBlockTextAlignment = tabBarTextblock.TextAlignment;
tabBarTextblock.TextAlignment = WTextAlignment.Center;
}
if (tabBarTextblock.HorizontalAlignment != WHorizontalAlignment.Center)
{
_oldBarTextBlockHorinzontalAlignment = tabBarTextblock.HorizontalAlignment;
tabBarTextblock.HorizontalAlignment = WHorizontalAlignment.Center;
}
}
else
{
// Restore old values.
tabBarTextblock.TextAlignment = _oldBarTextBlockTextAlignment;
tabBarTextblock.HorizontalAlignment = _oldBarTextBlockHorinzontalAlignment;
}
}
}
}
}
// If items have been made visible or collapsed in panel, invalidate current control measures.
if (invalidateMeasure)
{
Control.InvalidateMeasure();
}
}